R&S ZVH
Cable and Antenna Test Mode
Configuring Cable and Antenna Tests
Operating Manual 1309.6946.12 - 09
51
2.2.2 Configuring the Horizontal Axis
The FREQ/DIST key contains all necessary functions to define frequency and distance
parameters when performing cable measurements.
The contents of the menu depend on the currently selected measurement.
Coupling frequency and span settings across measurements
By default, the DTF measurement has its own configuration regarding frequency and
span settings. The other measurements (Reflection, Transmission and Cable Loss)
share the same frequency and span settings.
If required, you can couple the frequency and span settings across all measurements.
► Press the SETUP key.
► Press the "User Preference" softkey.
► Turn off the "Use Dedicated DTF Frequency Settings".
The R&S ZVH couples the frequency and span settings across all measurements.
2.2.2.1 Setting the Frequency Range for DTF Measurements
In the default setting, the R&S ZVH automatically selects a center frequency of 1 GHz
and a distance of 50 m. The R&S ZVH optimizes the settings for the best resolution, if
you change the stop distance.
If you have to keep the current frequency settings, it is best to define a manual span.
Setting the frequency span
When setting the frequency range, it is best to first set the span and then the center
frequency.
► Press the FREQ/DIST key.
► Press the "DTF Span" softkey.
By default, the R&S ZVH automatically calculates the best span ("Auto Span") for
the best length resolution. If the required span is too large for the current center
frequency, the R&S ZVH sets the center frequency to the smallest possible
frequency.
► Select the "Manual Span…" menu item
► Enter the span you need manually.
The R&S ZVH sets the new span. Note that the maximum span you can set
depends on the maximum cable distance you have defined and is never greater
than the span calculated by the "Auto Span" function. The minimum span that you
can set is 10 MHz.
